stunning development involving pop star kesha. Her mother joining her in rehab at the same facility at the same time, and speaking out about the event ts that she says drove her daughter there. Reporter: She's got the number one song on billboard's hot 100 charts. &#9834; You're going down &#9834; Reporter: But this morning it's what's going down in kesha's pernt life that is maki headlines. A week after revealing her private struggles with an eating disorder and checking herself into a rehab facility, her mother tells "people" she's entered the same facility for treatment of her own. Her mother said her daughter urge her to check into rehab for post traumatic stress disorder. Reporter: It stems from the con tant pressure put on her pop star daughter. Her maur said dr. Luke, kesha's producer who put pressure on her regarding her weight. Specifically, she mejed he called her a refrigerator in the past and it put a lot of pressure on her. However, dr. Luke's rep said the allegations are false and that he wishes kesha the best on her healing journey. Reporter:57-year-old siebert, a tennessee born song writer who collaborates with her daughter shared their close-knit relationship on the reality series, kesha, my beautiful rife. While coin siding rehab stints are not the norm. It's extraordinary, actually, that both kesha and her mom are getting help. It could save kesha's life. Reporter: Having family support when she's trying to get back up may be just what the doctor ordered. For "good morning america," cecilia vega, abc news, los angeles. And we wish them both all the very, very best.

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